Fiber mats for materials of construction having improved tear strength and process for making same
AssigneeBuilding Materials Investment Corporation
InventorsQinyun Peng, Krishna Srinivasan
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Abstract
The invention relates to a coated fiber mat of improved tear strength upon dividing pieces of the coated mat and the coating which comprises a cured, non-woven, fiber glass mat containing a polysiloxane wherein the fibers are fixedly distributed in a formaldehyde type binder containing a binder modifier which is a crosslinked styrene/acrylic polymer, and to a process for the preparation of the mat.
Claims32
A cured non-woven fiber mat comprising, by weight, from about 60 to about 95% fibers containing from about 0.001 to about 15% of a polysiloxane;
- said fibers fixedly distributed in from about 40 to about 5% of a formaldehyde type binder containing between about 0.1 and about 20% of a crosslinked styrene/(meth)acrylic polymer binder modifier
13 The mat of claim 12 wherein said mat is a glass mat employed in a roofing shingle.
20 The process of claim 14 wherein at least a portion of the polysiloxane is added to mat after drying or curing.
An asphalt coated roofing shingle comprising a cured, non-woven glass fiber mat of by weight, from about 0.001 to about 15% polysiloxane;
- from about 60 to about 95% glass fibers distributed in from about 40 to about 5% of a urea/formaldehyde binder containing between about 0.1 and about 20% of a crosslinked styrene/(meth)acrylic polymer.
25 The roofing shingle of claim 22 wherein the polysiloxane is between about 0.1 and about 2% of said modified binder.
An asphalt coated roofing sheet comprising a cured, polysiloxane containing, non-woven fiber glass mat of, by weight, from about 0.001 to about 15% polysiloxane;
- from about 60 to about 95% fibers distributed in from about 40 to about 5% of said modified urea/formaldehyde binder.
An uncured wet web mixture comprising from about 60 to about 95 wt. % glass fibers containing from about 0.001 to about 15 wt % of a polysiloxane and between about 40 and about 5 wt. % of a formaldehyde type binder containing between about 0.1 and about 20 wt. % of a crosslinked styrene/(meth)acrylic polymer for said binder.
Dependencies are inferred from the claim text.